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Titrations. Starter: HCl + NaOH NaCl +H 2 O H + + OH - H 2 O What do these reactions show? What conditions are necessary for this to occur?. How can use titrations to work out the concentration of a chemical. Glossary.
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Titrations Starter: HCl + NaOH NaCl +H2O H+ + OH - H2O What do these reactions show? What conditions are necessary for this to occur? How can use titrations to work out the concentration of a chemical
Glossary • Titration – a method for measuring the volumes of two solutions that react together. • Alkali – A soluble base with a pH less than 7.
Titrations -strong acid + strong alkali • = neutralise & form a salt -But ONLY if they are in exactly the right quantities. • Otherwise, one (acid or alkali) will be in excess Quick Check: -If there is more acid than alkali to start with in a neutralisation reaction, what will happen? • The final solution will be acidic
Titration • A way to measure volumes precisely • End Point • The point at which the acid and alkali have reacted completely. • This is shown using an indicator.
Concentration = no. of moles volume • Learn this formula triangle! number of moles n concentration (in moldm-3) volume (in dm3) c v
The Method • V:\Science\Teaching resource store\FreezerayChem Simulations\titrations[1].swfhttp://www.mhhe.com/physsci/chemistry/animations/chang_7e_esp/crm3s5_5.swf
Calculations Follow the example. Read the instructions and use them to answer the first half of the worksheet.